Area of a Parallelogram

Compare the rectangle ABCD and the parallelogram EFGH. Grab and move the point B to change the base of the rectangle. Grab and move the point D to change the height of the rectangle. Grab the point E and drag it as far as you can to the right. What conclusion can you make about the area of a parallelogram when it has the same base and height as a rectangle? Verify your conjecture by using the translation slider.

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